Abstract: A voltage output circuit and methods for operating voltage output circuits are disclosed. In some embodiments, a voltage output circuit comprises a power converter and a power converter controller, and is configured to provide a desired output voltage for charging an output. In some embodiments, the power converter comprises a first transistor and a second transistor. By using the power converter controller to control the power converter, a current through the first transistor may be increased until it reaches a value corresponding to the desired output voltage. When the value is reached, the first transistor may be turned off to cause a drain-to-source voltage of the second transistor to become zero. When the drain-to-source voltage of the second transistor becomes zero, the second transistor turns on, and an output of the power converter is charged to the desired output voltage.

Abstract: Methods and systems for mitigating EMI for electric vehicle chargers are disclosed. In some embodiments, the system comprises a power cabinet comprising a first PEM for charging a first electric vehicle and a second PEM for charging the first vehicle or a second electric vehicle. The first PEM and second PEM may be switched at different frequencies. In some embodiments, a difference between a first frequency of the first PEM and a second frequency of the second PEM is greater than a noise sampling frequency.

Abstract: Systems and methods for operating an asymmetric power converter for improved efficiency, service life, and operation are provided herein. In some embodiments, the system includes a power electronics module (PEM) configured to convert between alternating current (AC) power and direct current (DC) power. The power electronics module includes a power converter having a nominal power rating, and an overrated power converter having an overrated power rating with respect to the nominal power rating, wherein the power converter is one of an AC to DC power converter and a DC to DC power converter and the overrated power converter is the other of the AC to DC power converter and the DC to DC power converter.

Abstract: Systems and methods for operating a PEM including control circuitry are provided herein. The operation includes detecting, using the control circuitry, a drop in output current of the PEM, detecting, using the control circuitry, an increase in output voltage of the PEM, and in response to detecting the drop in output current and detecting the increase in output voltage, turning off the PEM using the control circuitry. Turning off the PEM may protect circuitry of the PEM from an interruption of a continuous power flow.

Abstract: Systems and methods for controlling a dual active bridge converter are disclosed herein. Switch control signals are provided to respective switches of at least one bridge of a dual active bridge converter. Control circuitry causes the switch control signals to switch according to a first switching sequence. After causing the switch control signals to switch according to the first switching sequence, the control circuitry causes the switch control signals to switch according to a second switching sequence, distinct from the first switching sequence, to distribute switching losses among the switches.

Abstract: Aspects of this technical solution can a first direct-current (DC) circuit to couple with a DC battery of an electric vehicle, a capacitor of the first DC circuit configured to charge to a capacitance that satisfies a threshold of activation of a second DC circuit, and the first DC circuit to transmit, in response to a determination that the capacitor satisfies the threshold of activation of the second DC circuit, DC power between the battery of the electric vehicle and the second DC circuit.

Abstract: Energy conversion is provided. An energy conversion device can include one or more power delivery interfaces. The energy conversion device can include a pre-charge circuit configured to charge a capacitor to an operating voltage. The energy conversion device can include a user accessible interface configured to provide energy to the pre-charge circuit. The pre-charge circuit can charge the capacitor associated with the one or more power delivery interfaces. The user-accessible interfaces can include a direct current (DC) input. The user-accessible interfaces can include an alternating current (AC) input.

Abstract: For open loop phase pre-charge, an apparatus includes a Switching Mode Power Supply (SMPS) charging diode and a charge generator. The SMPS charging diode pre-charges an SMPS to a regulation set point from at least one phase of an Alternating Current (AC) voltage. The charge generator is powered by the pre-charged SMPS. In response to detecting the regulation set point iteratively, the charge generator detects a specified phase angle of the AC voltage. In response to the specified phase angle, the charge generator iteratively generates a charging voltage during positive voltage interval that charges a Direct Current (DC) bus capacitor to a target DC bus voltage within a charging time interval. At least a portion of the charge generator comprises one or more of hardware and executable code, the executable code stored on one or more computer readable storage media.

Abstract: Systems and methods for controlling a dual active bridge converter are disclosed herein. A bus voltage of a dual active bridge (DAB) converter is detected and a first duty ratio of a primary bridge and a second duty ratio of a secondary bridge are determined, at least one of the first duty ratio and the second duty ratio are modified by adjusting at least one of a differential mode (DM) adjustment variable and a common mode (CM) adjustment variable based on the detected bus voltage. A plurality of switch control signals, which are provided to respective switches of the primary bridge and the secondary bridge, are caused to switch according to a time-based switching sequence based on the first duty ratio and the second duty ratio.

Abstract: Monitoring isolation resistance to validate vehicle charger functionality is provided. A system can include a first one or more resistors connected to a first terminal of a first direct current bus of a charger. The charger can be configured to deliver power to a first electric vehicle. The system can include a controller comprising circuitry. The controller can be configured to determine a resistance at the first one or more resistors. The controller can control delivery of power to the first electric vehicle responsive to a comparison of the resistance at the first one or more resistors with a threshold.

Abstract: Methods and systems for mitigating EMI for electric vehicle chargers are disclosed. In some embodiments, the system comprises a power cabinet comprising a first PEM for charging a first electric vehicle and a second PEM for charging the first vehicle or a second electric vehicle. The first PEM and second PEM may be switched at different frequencies. In some embodiments, a difference between a first frequency of the first PEM and a second frequency of the second PEM is greater than a noise sampling frequency.

Abstract: A voltage output circuit and methods for operating voltage output circuits are disclosed. In some embodiments, a voltage output circuit comprises a power converter and a power converter controller, and is configured to provide a desired output voltage for charging an output. In some embodiments, the power converter comprises a first transistor and a second transistor. By using the power converter controller to control the power converter, a current through the first transistor may be increased until it reaches a value corresponding to the desired output voltage. When the value is reached, the first transistor may be turned off to cause a drain-to-source voltage of the second transistor to become zero. When the drain-to-source voltage of the second transistor becomes zero, the second transistor turns on, and an output of the power converter is charged to the desired output voltage.

Abstract: Systems, methods, and computer-readable media for controlling a dual active bridge converter to distribute switching losses are disclosed herein. A plurality of switch control signals are provided to a plurality of switches, respectively, of at least one bridge of a dual active bridge converter. The plurality of switches comprises top switches and bottom switches. Control circuitry causes the plurality of switch control signals to switch according to a switching sequence comprising a plurality of stages. During at least one of the plurality of stages, the top switches are enabled concurrently with one another or the bottom switches are enabled concurrently with one another.

Abstract: A direct current fast charge (DCFC) system and associated method that lower standby power dramatically when the DCFC system is not in operation, and that provide a reset capability for communication needs. The DCFC system utilizes an appropriate load disconnection switch and an associated control and communication circuit, timer circuit, and automatic turn on system. This improves the reliability of the electronics by removing voltage stress during the standby mode. The DCFC system prevents energy waste, and therefore provides a “green” alternative to conventional DCFC systems.

Abstract: A transformerless parallel active rectifier system includes N multiphase common mode inductors directly connected to a shared multiphase AC input with no intervening transformer, and N active rectifiers coupled to respective ones of the N multiphase common mode inductors and having respective DC outputs coupled to a shared DC bus, where N is an integer greater than 1. The N active rectifiers have ground current regulators and are synchronized to provide DPWM switching control signals synchronized to one another to regulate their respective ground currents and concurrently regulate the shared DC bus voltage.

Abstract: Systems and methods for controlling a dual active bridge converter are disclosed herein. Switch control signals are provided to respective switches of at least one bridge of a dual active bridge converter. Control circuitry causes the switch control signals to switch according to a first switching sequence. After causing the switch control signals to switch according to the first switching sequence, the control circuitry causes the switch control signals to switch according to a second switching sequence, distinct from the first switching sequence, to distribute switching losses among the switches.

Abstract: A power conversion system includes a sensing circuit to sense a system voltage of a DC bus circuit with a first DC bus terminal with a first voltage positive relative to a second voltage of a second DC bus terminal. The sensing circuit includes a first capacitor having a first terminal coupled to the second DC bus terminal, and a second terminal; a second capacitor having a first terminal coupled to the second terminal of the first capacitor, and a second terminal coupled to a reference node; and a resistive divider circuit coupled across the first capacitor and having an output terminal that delivers a voltage signal corresponding to a voltage across the first capacitor.

Abstract: For motor stator resistance calculation, a method estimates an output voltage using a Direct Current (DC) bus voltage and a duty ratio for a motor drive at a first switching frequency and at least one second switching frequency. The method measures an output current at the first switching frequency and the at least one second switching frequency. The method calculates a first stator resistance for the first switching frequency and at least one second stator resistance for the at least one second switching frequency. The method estimates a stator resistance at a DC condition based on the first stator resistance and the at least one second stator resistance. The method sets a dynamic compensation based on a stator resistance error between the first switching frequency and the at least one second switching frequency.

Abstract: Methods, non-transitory computer readable mediums, and power conversion systems with a controller configured to provide modulated inverter switching control signals at a first switching frequency in response to an inverter current being greater than a first threshold and less than a second threshold, the second threshold being greater than the first threshold. The controller is further configured to provide the inverter switching control signals at a second switching frequency in response to the inverter current being greater than the second threshold, and to provide the inverter switching control signals at a third switching frequency in response to the inverter current being less than the first threshold, where the second switching frequency is less than the first switching frequency and the third switching frequency is greater than the first switching frequency.

Abstract: For open loop phase pre-charge, an apparatus includes a Switching Mode Power Supply (SMPS) charging diode and a charge generator. The SMPS charging diode pre-charges an SMPS to a regulation set point from at least one phase of an Alternating Current (AC) voltage. The charge generator is powered by the pre-charged SMPS. In response to detecting the regulation set point iteratively, the charge generator detects a specified phase angle of the AC voltage. In response to the specified phase angle, the charge generator iteratively generates a charging voltage during positive voltage interval that charges a Direct Current (DC) bus capacitor to a target DC bus voltage within a charging time interval. At least a portion of the charge generator comprises one or more of hardware and executable code, the executable code stored on one or more computer readable storage media.